CN103222904B

CN103222904B - Distributed acetabular component

Info

Publication number: CN103222904B
Application number: CN201310153406.9A
Authority: CN
Inventors: 韦山; 王成焘; 周海; 李元超; 林艳萍
Original assignee: Shanghai Jiaotong University
Current assignee: Shanghai Jiaotong University
Priority date: 2013-04-27
Filing date: 2013-04-27
Publication date: 2015-10-14
Anticipated expiration: 2033-04-27
Also published as: CN103222904A

Abstract

A kind of distributed acetabular component of biomedical engineering field, comprise backing, connector and potsherd, backing is spherical metal, the first micropore is uniform-distribution with at the outer surface of backing, the second micropore is uniform-distribution with at the inner surface of backing, potsherd side is that one has tapering or step or is with fluted column, the large end face of potsherd, together with side and backing are adhered by connector, connector is high molecular polymer, connector is extruded in the second micropore on backing inner surface by injection molding manner, potsherd is large, small end face is all processed into spherical crown surface shape.The present invention can reduce the overall wall thickness of manual acetabulum, improves the diameter of artificial hip joint system pottery bulb, thus increases the range of movement of artificial hip joint; Solve the cracked problem that liner is monoblock type pottery; Alleviate the quality of hip joint, make patient moving lighter and handier; There is certain anti-impact force and Noise Reduction; Be applicable to the artificial hip joint system of ceramic-on-ceramic.

Description

Distributed acetabular component

Technical field

What the present invention relates to is a kind of orthopaedics implant prosthese, particularly a kind of distributed acetabular component of biomedical engineering field.

Background technology

Replacement of Hip Joint is the effective clinical treatment of one of the Hip injury that treatment causes because of wound or disease.Artificial hip joint system is made up of acetabular bone and joint handle, bulb.Common acetabular bone is made up of metal backing and liner, and backing material is metal, and inner lining material is metal, pottery and macromolecular material, and bulb material is metal and pottery.Bulb contacts with liner and forms friction pair.The artificial hip joint used clinically at present has following several types: 1, metal ball-head and metal inner lining join pair, this joins the secondary friction pair formed in long-term process of friction and wear, there is poisonous metal ion to separate out, in human body, be accumulated to finite concentration can cause chronic disease, wear debris can induce the osseous tissue of Periprosthetic to produce bone dissolving simultaneously, 2, metal or ceramic bulb and macromolecular lining join pair, this joins the secondary friction pair formed makes the wear rate of macromolecular lining very high, the most frequently used macromolecular material is ultra-high molecular weight polyethylene, within its year, wear extent is about 0.2mm, in long-term friction process, the thickness of macromolecular lining can be caused constantly to reduce, and then affect the intensity of liner, this artificial joint system creates the contradiction of joint large moving range and mechanical strength, in order to solve this contradiction, thickness of inner lining must thicken, the diameter having certainly led to the bulb coordinated with liner thus reduces, so the range of movement of articular system can reduce, and then cause joint dislocation, cause inefficacy, 3, ceramic bulb and ceramic-linedly join pair, this joins the friction pair of secondary composition, and experiment proves that wearing and tearing are minimum, and pottery has inertia and good biocompatibility simultaneously, and thus the artificial hip joint system of ceramic-on-ceramic becomes the first-selection of current Clinical practice.But due to ceramic material fragility inherently, if thickness is thin, then easily cause cracked, in order to overcome this shortcoming, ceramic-lined thickness must thicken, and is usually about 8 ~ 10mm, but thereby produce the problem that the Ceramic Balls area of bed coordinated with it has to diminish, thus limit the range of movement of artificial hip joint, and then there is joint dislocation, cause artificial joint to lose efficacy.Research shows that the range of movement of some daily behavior action of Aisan will obviously be greater than west ethnic group, especially squat and kneel, therefore Aisan needs larger bulb diameter especially, also namely thinner acetabular bone liner.

Therefore, building the ceramic-on-ceramic Novel artificial hip joint system with large scale bulb and ultra-thin acetabular bone wall of cup, increase the range of movement of artificial hip joint, reduce lined ceramics cracked, improve its service life, is the necessity improving Quality of Life of Patients.

Retrieval prior art document, finds publication number: CN101677861, title: be a kind of acetabular cup disclosed in " having the porous metal cup of cobalt bearing surface ", comprise cup portion and supporting member.Described cup portion can comprise the outer pure titanium internal layer with having the second thickness of the porous metals with the first thickness.This is a kind of acetabular cup of simple metal material, and cup mortar wall is relatively thin, effectively can increase the range of movement of artificial hip joint, but there is metal ion precipitation, causes local organization pathological changes, and the defect that wear debris induction Periprosthetic bone dissolves.Publication number: CN102488573A, title: " a kind of artificial acetabulum made of discrete ceramic cylinders " discloses a kind of manual acetabulum, comprise porous metals shell, metal net shaped Inner shell and ceramics cylinder, the connected mode of ceramics cylinder and metal shell and Inner shell is mechanical attachment, this structure makes acetabular bone wall relatively thin, effectively can increase the range of movement of artificial hip joint, but the distribution of the circular port of discrete existence inside Inner shell is more sparse, ceramics pole and the total contact area of bulb is caused to diminish, make each ceramics pole contact stress become large, easily produce cracked tendency.Simultaneously ceramics pole requires very high machining accuracy and surface roughness with the mating surface of metal shell, liner, and greatly, cost is high for manufacture difficulty.

Summary of the invention

The present invention is directed to above-mentioned the deficiencies in the prior art, provide a kind of and ceramic bulb and join secondary distributed acetabular component, this acetabular component manufacture difficulty is less.

The present invention is achieved through the following technical solutions, the present invention includes: backing, connector and potsherd, backing is spherical metal, the outer surface of backing is uniform-distribution with the first micropore, the inner surface of backing is uniform-distribution with the second micropore, potsherd side is that one has tapering or step or is with fluted column, the large end face of potsherd, together with the side of potsherd and backing are adhered by connector, connector is a kind of high molecular polymer, connector after injection moulding and the small end face of potsherd are in same sphere, potsherd large, small end face is all processed into spherical crown surface shape.

Further, in the present invention, connector is a kind of ultra-high molecular weight polyethylene and composite thereof, the preparation method of backing comprises powder metallurgy sintered method, plasma spraying method and rapid three dimensional printing forming technology, the material of backing comprises medical stainless steel, titanium and titanium alloys, tantalum and alloy thereof, cochrome, and the thickness of backing is 3mm to 6mm, and the shape of potsherd is cylinder or polygon prism, the thickness of potsherd is 1.5mm to 5.0mm, and the material of potsherd is oxide ceramics.

In implementation process of the present invention, the inner surface on the large end face of potsherd, the side of potsherd and porous metals backing is linked together by the adhesive effect of connector, and connecting mode is for being adhered connection; Connector is extruded to the second nanopores on backing inner surface by injection molding manner; The bone growth of nature pelvis, in the first nanopores of backing outer surface, reaches acetabular component and is connected effect with the biology of natural pelvis; The small end face of potsherd contacts with ceramic bulb and forms friction pair; All potsherd small end faces become matched in clearance with corresponding Ceramic Balls capitiform.

Compared with prior art, the present invention has following beneficial effect: the present invention replaces the monoblock type that thickness is large ceramic-lined with the some potsherds arranged by distributed rule on spherical backing, so reduce the overall wall thickness of manual acetabulum, improve the diameter of ceramic bulb, thus increase the range of movement of artificial hip joint; Solve the cracked problem that liner is monoblock type pottery; Alleviate the quality of hip joint, make patient moving lighter and handier; Reduce manufacturing process, reduce precision and the difficulty of pottery manufacture; There is certain impact resistance and Noise Reduction simultaneously.

Accompanying drawing explanation

Fig. 1 is the structural representation of first embodiment of the invention;

Fig. 2 is the potsherd schematic three dimensional views in first embodiment of the invention;

Fig. 3 is the potsherd schematic three dimensional views in second embodiment of the invention;

Wherein: 1, backing, 2, connector, 3, potsherd, the 4, first micropore, the 5, second micropore.

Detailed description of the invention

Elaborate to embodiments of the invention below in conjunction with accompanying drawing, the present embodiment, premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.

embodiment

As depicted in figs. 1 and 2, the present invention includes backing 1, connector 2 and potsherd 3, backing 1 is spherical metal, the outer surface of backing 1 is uniform-distribution with the first micropore 4, the inner surface of backing 1 is uniform-distribution with the second micropore 5, potsherd 3 side is that one has tapering or step or is with fluted column, the large end face of potsherd 3, together with the side of potsherd 3 and the micropore 5 on backing 1 are adhered by connector 2, connector 2 is ultra-high molecular weight polyethylene, connector 2 is extruded to inside the second micropore 5 on backing inner surface by injection molding manner, backing 1 adopts powder metallurgy sintered legal system standby, the material of backing 1 is medical titanium alloy, the thickness of backing 1 is 3mm to 6mm, the shape of potsherd 3 is positive six prisms, thickness is 1.5mm to 5.0mm, six faceted pebbles of potsherd 3 have tapering, two end faces of potsherd 3 are spherical crown surface shape, connector 2 after injection moulding is in same sphere with the small end face of potsherd 3, the material of potsherd 3 is aluminium oxide ceramics.

Fig. 3 is an alternative embodiment of the invention, and the structure of this embodiment is substantially identical with the embodiment shown in Fig. 1; Difference is, potsherd 3 is replaced by the cylinder with tapering in figure 3.

Claims

1. a distributed acetabular component, comprise backing (1), backing (1) is spherical metal, it is characterized in that, also comprise connector (2) and potsherd (3), the outer surface of backing (1) is uniform-distribution with the first micropore (4), the inner surface of backing (1) is uniform-distribution with the second micropore (5), potsherd (3) side is that one has tapering or step or is with fluted column, the inner surface of backing (1) is evenly arranged some potsherds (3) by distributed rule, the large end face of potsherd (3), together with the side of potsherd (3) and backing (1) are adhered by connector (2), connector (2) is a kind of high molecular polymer, connector (2) is extruded to the second micropore (5) the inside on backing (1) inner surface by injection molding manner, potsherd (3) is large, small end face is all processed into spherical crown surface shape, connector (2) is a kind of ultra-high molecular weight polyethylene and composite thereof, the preparation method of backing (1) comprises powder metallurgy sintered method, plasma spraying method and rapid three dimensional printing forming technology, the material of backing (1) comprises medical stainless steel, titanium and titanium alloys, tantalum and alloy thereof, cochrome, the thickness of backing (1) is 3mm to 6mm, the shape of potsherd (3) is cylinder or polygon prism.

2. distributed acetabular component according to claim 1, is characterized in that, the connector (2) after injection moulding is in same sphere with the small end face of potsherd (3).

3. distributed acetabular component according to claim 1, is characterized in that, the thickness of potsherd (3) is 1.5mm to 5.0mm.

4. distributed acetabular component according to claim 1, is characterized in that, potsherd (3) is oxide ceramics.